function Level(options) {
	this.name = options.name;
	this.mainTower = options.mainTower;
	this.initialMoney = options.initialMoney;
	this.routes = options.routes;
	this.freqPerEnemyType = options.freqPerEnemyType;
	
	if(options.enemies instanceof Array) {
		this.enemies = options.enemies;
	} else {
		alert('Enemies should be an instance of Array');
	}
};